Bay Area Air Quality on Twitter: "Air District issues Health .... Bay Area Air Quality on Twitter: "Air District issues Health Advisory and Spare the Air Alert due to very unhealthy air quality from #winecountryfires ....1199 x 800 px

Bay Area smoke advisory issued again due to wildfires. A firefighter covers his eyes as he walks past a burning hillside in Santa Rosa,.530 x 350 px

Fires create 'worst air quality ever recorded' in Bay Area. The view of the Bay Area is filled with a smoky haze on Tuesday, Oct.594 x 350 px

China sees difficulty meeting 2017 air quality targets: minister .... FILE PHOTO: People make their way through heavy smog on an extremely polluted day with.450 x 300 px